Superficial Branch of the Radial Nerve, Posterior View

Description

Running along the posterior and lateral forearm, the superficial branch of the radial nerve (terminal cutaneous continuation of the musculospiral nerve) is traced as it courses deep to brachioradialis, emerging in the distal third of the forearm between brachioradialis and extensor carpi radialis longus. Distally, its branches fan toward the dorsolateral hand, crossing superficially near the radial styloid and distributing over the dorsal thumb, index finger, and radial half of the middle finger, with digital territories shown in relation to the extensor tendons on the dorsum. Nearby dorsal venous channels and superficial arterial companions of the radial side are suggested, helping orient the nerve’s subcutaneous segment as it passes from proximal muscular cover to distal fascial planes. This is a posterior perspective of a male adult forearm and hand. That transition point, where the nerve becomes superficial near the radial styloid, is the clinical pain point. It is the typical site of Wartenberg syndrome (cheiralgia paresthetica), where compression from a tight watchband, handcuffs, or repetitive pronation and ulnar deviation produces dysesthesia over the dorsoradial hand without motor deficit. The same anatomy matters when placing portals for wrist arthroscopy or making a radial-sided incision for De Quervain release, where iatrogenic neuroma of the superficial radial nerve remains a known complication. Use this illustration in upper-limb anatomy teaching to contrast the superficial radial nerve’s purely cutaneous distribution with the deep branch (posterior interosseous nerve), and in surgical or sports-medicine publications discussing dorsoradial wrist pain, sensory mapping, and safe dissection planes around the first dorsal compartment. It also supports patient-facing or clinician education materials on nerve entrapment and post-procedural sensory symptoms after radial wrist interventions. Anatomical accuracy verified by SciePro's Medical Advisory Board.